THE FLIP LAB · TOOL

Resale Shipping Cost Planner

Don’t let a big box ruin a little bargain.

Estimate the weight and outside dimensions after packing, then choose USPS Flat Rate retail or commercial postage when your item fits, or get a real quote for services priced by weight and zone. Rates are dated and editable; they are not live shipping labels or guaranteed checkout quotes.

See full calculator explanation →

SMART PRESETS · U.S. SELLERS

Where will you sell it?

Choose a marketplace and shipping service. We'll fill in the fee and postage assumptions—you can still edit every amount.

Rates reviewed Nov 1, 2026

Selling marketplace

Who handles buyer postage?

Shipping service / packaging

Use real quoted prices for zone/weight services.

USPS Flat Rate price class

Official USPS rates effective Oct 4, 2026. Box/envelope must fit; extras may apply.

Official marketplace fee schedule ↗USPS current price list ↗Get an actual USPS quote ↗

THE FIND

What did you pay? $Expected sale price $Shipping charged to buyer $Marketplace fee percentage %Fixed transaction fee $

YOUR REAL COSTS

Shipping you pay $Packaging supplies $Cleaning and repairs $Other costs $Minimum acceptable profit $

OPTIONAL SELLING ADJUSTMENTS

Buyer sales tax (for fees only; not your revenue)$Promoted listing / boost fee (% of item price)%

Sales tax is not added to seller proceeds. Some marketplace processing fees apply to it; extra listing, subscription, taxes on fees, or optional advertising charges may still apply. Place nonpercentage expenses in Other costs.

ESTIMATED NET PROFIT$32.23Checking your numbers...

ROI on acquisition + direct costs0%

Break-even item sale price$0.00

All-in selling fees$0.00

Net margin on buyer payments0%

Where the money goes

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Results are scenarios, not professional appraisals or live market-price estimates. Marketplace presets are U.S. baseline assumptions, not a final fee quote. Calculations adjust for each preset’s fee basis and selected shipping-payment method. Review your own category, account tier, taxes, ads, label eligibility and marketplace statement.